Seattle Mariners vs Washington Nationals Prediction 6/13/2026 Today’s MLB Picks

In this article, we will formulate a Mariners vs Nationals Prediction for this MLB matchup on Saturday, June 13th in the second game of this series. Let’s take a look at the prediction for this MLB matchup.

Washington Nationals Preview

The Washington Nationals have a 35-35 record this season and are sitting in the 4th place of the NL East. They have a 12-21 home record and are coming off a 2-10 home defeat against the Mariners. They will face the Royals and the Rays next.

The Nationals have a .244 batting average this season, .321 OBP and .418 Slugging percentage. Washington’s pitching staff has a 4.74 ERA and 1.39 WHIP. CJ Abrams is the team’s best hitter with a .284 batting average, also leading the team in RBI with 51. James Wood adds a team-high 19 home runs.

Cade Cavalli (R) is the projected starting pitcher for the Nationals, and he has a 3-4 record, 3.88 ERA and 1.44 WHIP.

Seattle Mariners Preview

The Seattle Mariners have a 37-34 record this season and are sitting in the 1st place of the AL West. They have a 18-18 road record and are coming off a 10-2 road win against the Nationals. They will face the Orioles and the Red Sox next.

The Mariners have a .238 batting average this season, .318 OBP and .401 Slugging percentage. Seattle’s pitching staff has a 3.57 ERA and 1.18 WHIP. Randy Arozarena is the team’s best hitter with a .291 batting average. Luke Raley leads the team in RBI with 35, adding a team-high 14 home runs.

Luis Castillo (R) is the projected starting pitcher for the Mariners, and he has a 2-5 record, 5.16 ERA and 1.36 WHIP.

Seattle Mariners @ Washington Nationals Betting Trends: June 13, 2026

• Probable Starting Pitcher: Cade Cavalli      Record this season: 3-4      ERA: 3.88
• Home Record: 1-2
• Last 5 against Mariners: –

Why the Washington Nationals will win

• The Mariners have lost six of their last seven road games against NL East opponents following a win.
• The Nationals have won eight of their last nine games as favorites against American League opponents following a loss.
• The Nationals have covered the run line in 10 of their last 11 games against American League opponents after playing the previous day.
• The Mariners have failed to cover the run line in each of their last four games against the Nationals following a win.
• The Nationals have led after 3 innings in four of their last five games as favorites.
• The Mariners have trailed after 5 innings in seven of their last eight games as underdogs against NL East opponents.

• Probable Starting Pitcher: Luis Castillo      Record this season: 2-5      ERA: 5.16
• Road Record: 1-3
• Last 5 against Nationals: 1-4

Why the Seattle Mariners will win

• The Nationals have lost each of their last three games as home favorites.
• The underdogs have won five of the Nationals’ last seven games at Nationals Park.
• The Nationals have failed to cover the run line in each of their last eight day games against American League opponents following a home loss.
• The Mariners have covered the run line in each of their last six games as road underdogs after playing the previous day.
• The Mariners have led after 3 innings in seven of their last eight road day games.
• The Nationals have lost the first inning in three of their last four day games against American League opponents that held a winning record.
• The Nationals have trailed after 5 innings in each of their last five day games at Nationals Park against AL West opponents.

Total Runs Facts

• Each of the Nationals’ last seven games as favorites have gone OVER the total runs line.
• Five of the Mariners’ last six games as underdogs against NL East opponents have gone OVER the total runs line.
• The ‘Inning 1 OVER 0.5 runs’ market has hit in eight of the Mariners’ last nine games as road underdogs against NL East opponents.
• The ‘Inning 1 UNDER 0.5 runs’ market has hit in seven of the Nationals’ last eight day games at Nationals Park.

Washington Nationals Player Prop Facts

• Keibert Ruiz has hit a home run in each of the Nationals’ last two games as favorites against AL opponents.
• Keibert Ruiz has recorded at least one hit in 12 of his last 13 appearances in day games.
• Nasim Nunez ranks 1st in the league in Steals (25) this season.

Seattle Mariners Player Prop Facts

• Luis Castillo has recorded a win in three of his last four appearances against NL opponents.
• Luis Castillo has recorded five or more strikeouts in 18 of his last 20 appearances against NL East opponents.
• Cal Raleigh has hit a home run in each of his last two road appearances against NL East opponents.
• Randy Arozarena has recorded at least one hit in each of the Mariners’ last seven games as road underdogs.

Matchup/League Facts

• The Nationals rank 1st in the league for RBIs this season (354).
• The Nationals rank 2nd in the league for runs scored this season (374).
• The Mariners rank 1st in the league for walks allowed this season (185).
• The Mariners rank T3rd in the league for home runs this season (93).

Mariners vs Nationals Prediction

The Nationals are 7-3 in their last 10 meetings against the Mariners but have lost their last two meetings in Washington. Their last five meetings have gone over the total.

In this Mariners vs Nationals Prediction, both teams are coming at a pickem price. The Mariners won easily by 10-2 yesterday and I expect them to keep rolling today. Luis Castillo looks to have turn things around, as he has just two earned runs across his last 14.2 innings pitched, while Cavalli has given up at least two runs in 8 of his last 9 starts. On top of that, the Mariners have a superior bullpen and I expect them to get the job done on the road.

Nikos Lagouretos's Pick: Seattle Mariners ML